Japanese designer Nendo has produced a collection of candles which slowly reveal color and scent as it burns. Called ‘Sunset’ candles, each appear white at first, but once lit, the heat reacts to the center and begins changing to yellow then orange, red, purple, and finally to blue. The idea was influenced by the shifting shades of light during sunset; reflecting the soft transitioning of hues. Each color is accompanied by a scent: bergamot, lemongrass, sweet marjoram, lavender, and geranium. By combining scent and sight, the candle not only provides illumination, but represents the passage of time.
source : Designboom